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CompoundAction Class

Manages a group of edit operations that are treated as a single operation.

This API is not CLS-compliant. The CLS-compliant alternative is [None].

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.Package.CompoundActionBase
    Microsoft.VisualStudio.Package.CompoundAction

Namespace:  Microsoft.VisualStudio.Package
Assemblies:   Microsoft.VisualStudio.Package.LanguageService.9.0 (in Microsoft.VisualStudio.Package.LanguageService.9.0.dll)
  Microsoft.VisualStudio.Package.LanguageService.10.0 (in Microsoft.VisualStudio.Package.LanguageService.10.0.dll)
  Microsoft.VisualStudio.Package.LanguageService.11.0 (in Microsoft.VisualStudio.Package.LanguageService.11.0.dll)
  Microsoft.VisualStudio.Package.LanguageService (in Microsoft.VisualStudio.Package.LanguageService.dll)

Syntax

'宣言
<CLSCompliantAttribute(False)> _
Public Class CompoundAction _
    Inherits CompoundActionBase
[CLSCompliantAttribute(false)]
public class CompoundAction : CompoundActionBase

The CompoundAction type exposes the following members.

Constructors

  Name Description
Public method CompoundAction Initializes a new instance of the CompoundAction class.

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Methods

  Name Description
Public method Abort Terminates the current compound action, throwing away all edits. (Overrides CompoundActionBase.Abort().)
Public method Close Closes the compound action and commits all edits to the source file. (Overrides CompoundActionBase.Close().)
Public method Dispose() Deallocates any resources just before the CompoundAction object is destroyed.
Public method Dispose() Deallocates any resources just before the CompoundAction object is destroyed. (Inherited from CompoundActionBase.)
Public method Equals Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method FlushEditActions Flushes any pending edit actions from the current compound action. (Overrides CompoundActionBase.FlushEditActions().)
Public method GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)

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Fields

  Name Description
Protected field action Interface for a CompoundAction action. (Inherited from CompoundActionBase.)
Protected field opened Specifies if a compound action has been opened. (Inherited from CompoundActionBase.)

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Remarks

This class is used to simplify wrapping a collection of edit operations into a single undoable event. This is achieved by calling the OpenCompoundAction method on the IVsCompoundAction interface that is obtained from the current IVsTextLines object stored in the Source object. When this class is disposed off, the IVsCompoundAction interface is closed and that commits all the edit events made to the IVsTextLines object as a single operation.

Notes to Implementers

This class contains everything necessary to open a compound action given a Source object and to close that action when this class is disposed off.

Notes to Callers

Instantiate a CompoundAction object with the Source object when you need to wrap one or more edit operations that can be undone in a single action. Then perform your edit operations as normal. When the new CompoundAction object is disposed of, the edit operations are stored as a single action.

If you have access to the IVsTextView object, use CompoundViewAction class instead as it allows the text view to optimize the edits so only the final result is seen by the user.

Examples

This example shows how to use the CompoundAction class. This example inserts a list of words at the current location in the source file. Without the CompoundAction object, each of these insertions is treated as a separate edit event and requires a separate undo operation. However, with the CompoundAction object, the entire list can be undone with a single undo operation.

using Microsoft.VisualStudio.Package

namespace MyLanguagePackage
{
    class CMyLanguageService : LanguageService
    {
        // Insert the list of words, one per line.
        void InsertWords(Source src,string[] wordList)
        {
            if (LastActiveTextView != null)
            {
                CompoundAction action = new CompoundAction(src,"Update source");
                using (action)
                {
                    int currentLine = 0;
                    int currentCol = 0;
                    LastActiveTextView.GetCaretPos(out currentLine, out currentCol);
                    // Insert list in reverse so the words appear in the proper
                    // order in the sourec file.
                    for (int i = wordList.Length - 1, i >= 0; i--)
                    {
                        string w = wordList[i] + "\n";
                        src.SetText(currentLine, currentCol, currentLine, currentCol, w);
                    }
                }
            }
        }
    }
}

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

Microsoft.VisualStudio.Package Namespace